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2026
ACL
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X.Fang, M.Vigier, V.Castaing, A.I.Becerro, G.Lozano, E.Veron, M.J.Pitcher, M.Allix, 'Persistent Luminescence in Highly Nonstoichiometric GAGG Garnets Gd3+x[Al2Ga3]1-x/5O12 (0 ≤ x ≤ 0.6) Doped with Ce3+/Cr3+', Adv. Opt. Mater. 14 e02509 (2026) doi:10.1002/adom.202502509
The gadolinium garnet Gd3Al2Ga3O12 co-doped with Ce3+ and
Cr3+ (GAGG-Ce,Cr) has been widely studied due to its unusual bright yellow
long-lasting persistent luminescence properties. Here, rapid containerless
melt-quenching is used as part of a two-step glass-crystallisation
synthesis process to obtain a new highly nonstoichiometric form of
this garnet, of composition Gd3+x[Al2Ga3]1-x/5O12 with 0 ≤ x ≤ 0.6 (ns-GAGG).
For compositions x > 0, powder X-ray diffraction analysis confirms that excess
Gd3+ is accommodated at the Al3+/Ga3+ sublattice in octahedral coordination,
by substituting up to 30% of these sites. This mode of substitution
complexifies the local structure of the garnet host, which is shown to influence
certain luminescence properties in the analogous highly nonstoichiometric
Y3+xAl5-xO12 (0 < x < 0.4) and Gd3+xAl5-xO12 (0 < x < 0.6) systems.
Co-doping ns-GAGG with Ce3+ and Cr3+ produces green-yellow persistent
luminescence when x = 0, which undergoes a redshift to yellow-orange
as the Gd3+ content increases to x = 0.4. However, this radical modification
of the host composition does not strongly affect the afterglow kinetics.
These results demonstrate an effective and high-precision way of decoupling
color and kinetics in persistent luminescent garnets, which is usually hard
to achieve using the standard stoichiometric material engineering approach.
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